package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.Result;
import com.sky.service.ShoppingCartService;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.DeleteMapping;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    //添加购物车
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {


        //判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId= BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list =shoppingCartMapper.list(shoppingCart);

        //如果已经存在,只需要将数量加一
        if(list!=null && list.size()>0){
            ShoppingCart cart=list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在,需要插入一条购物车数据

            //判断本次添加是菜品还是套餐
            Long dishId=shoppingCartDTO.getDishId();
            if(dishId!=null){
                //本次添加的是菜品
                Dish dish=dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //本次添加的是套餐
                Long setmealId=shoppingCartDTO.getSetmealId();
                Setmeal setmeal =setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }

    }

    //查看购物车
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId=BaseContext.getCurrentId();
        ShoppingCart shoppingCart=ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
        return list;
    }

    //清空购物车
    @Override
    public void cleanShoppingCart() {
        //获取当前用户的id
        Long userId=BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    //删除购物车中的一个商品
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //获得购物车中的数据
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //判断是否为空
        if(list!=null&&list.size()>0){
            shoppingCart=list.get(0);
            Integer number = shoppingCart.getNumber();
            //判断数量
            if(number==1){
                //份数为1,直接删除该数据
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //份数不止一份,份数减一
                shoppingCart.setNumber(shoppingCart.getNumber()-1);
                shoppingCartMapper.updateNumberById(shoppingCart);

            }
        }


    }


}
